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Electron‐Acceptor‐Dependent Light Absorption, Excited‐State Relaxation, and Charge Generation in Triphenylamine Dye‐Sensitized Solar Cells
Author(s) -
Li Renzhi,
Zhang Min,
Yan Cancan,
Yao Zhaoyang,
Zhang Jing,
Wang Peng
Publication year - 2015
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201402806
Subject(s) - triphenylamine , excited state , photochemistry , electron donor , electron acceptor , chemistry , ultrafast laser spectroscopy , acceptor , absorption (acoustics) , intramolecular force , materials science , atomic physics , spectroscopy , organic chemistry , physics , quantum mechanics , composite material , condensed matter physics , catalysis
By choosing a simple triphenylamine electron donor, we herein compare the influence of electron acceptors benzothiadiazole benzoic acid (BTBA) and cyanoacrylic acid (CA), on energy levels, light absorption, and dynamics of excited‐state evolution and electron injection. DFT and time‐dependent DFT calculations disclosed remarkable intramolecular conformational changes for the excited states of these two donor–acceptor dyes. Photoinduced dihedral angle variation occurs to the triphenylamine unit in the CA dye and backbone planarization happens to conjugated aromatic blocks in the BTBA dye. Femtosecond spectroscopic measurements suggested the crucial role of having a long excited‐state lifetime in maintaining a high electron‐injection yield because a reduced driving force for a low energy‐gap dye can result in slower electron‐injection dynamics.